Why are plants unable to grow at the bottom of lakes? a. the water is colder at the bottom. b. sunlight does not reach the bottom. c. groundwater feeds into the bottom. d. less fresh water is found at the bottom.

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.